The Case IH Magnum 325 tractor primary air filter part number is AF25525. The inner safety filter is 87799.
Case IH Magnum 325 Air Filter Details
Primary air filter part number
AF25525
Inner safety air filter part number
87799
Outer air filter part number
381423R92
Air filter dimensions
Outside diameter: 9.9 in | Height: 16.4 in
Air Filter Service Interval Guide
Air Filter Service Interval Guide
Dusty use
100 hrs
Average
500 hrs
Light use
1,000 hrs
Listed Filter Size Check
Height
16.4 in
Outside diameter
9.9 in
These are practical inspection/replacement guide ranges for the large ag tractor category. Dusty work can shorten the interval heavily, so use the restriction indicator and operator manual first.
Case IH Magnum 325 Extra Air Filter Notes
Engine model
FPT 8.7L
Engine displacement
8.7 L | 530.9 cu in
Engine horsepower
325 hp | 242.4 kW
Primary filter note
For the Case IH Magnum 325, the listed primary air filter part number is AF25525. Match the number before buying because air cleaner setups can vary by engine, serial range and market.
Outer filter note
The listed outer air filter part number is 381423R92.
Safety filter note
The listed inner safety air filter is 87799. Do not remove the safety element for normal cleaning; replace it if dirty, damaged or oil-soaked.
Fitment note
Listed dimensions: Outside diameter: 9.9 in | Height: 16.4 in. Use dimensions as a second check, not as the only buying method.
Filter size note
The listed dimensions point to a long element length at 16.4 in and large outside diameter at 9.9 in. Use that as a fitment sanity check against the old filter.
Power range note
Use the power class to decide urgency. Higher airflow demand means less patience for questionable media, bad seals or packed pleats.
Engine airflow note
The displacement helps identify the engine family; horsepower tells you how hard it breathes under load. The element still has to match the canister.
Service note
Clean loose dust from the air cleaner housing before pulling the filter. Never run the tractor with the filter removed, even for a quick test.
Case IH Magnum 325 Air Filter FAQs
Is airflow likely to be sensitive on the Case IH Magnum 325?
If the tractor is under load, a marginal or dirty element will matter more than it does at idle. Use the size/power combo as a reason to inspect before heavy dusty jobs.
What should I buy for a full Case IH Magnum 325 air-filter service?
For a full parts check, separate the service element from the safety element: buy the outer/primary service element first, then buy the inner safety element only if it is dirty, damaged or due. Do not accidentally order 381423R92 when you meant the safety filter, or 87799 when you meant the outer filter.
What is the safest way to match a Case IH Magnum 325 air filter?
The buying order should be: old filter number first, housing fit second, then cross-reference. Start with AF25525, but do not ignore the a primary, outer and inner safety element setup. The size data points to a large and deep element, so compare the removed element against both length and outside diameter before fitting.
Should I trust Case IH Magnum 325 air-filter dimensions or the part number?
Use the listed length and OD together. Length alone can get the filter into the housing; OD and seal shape decide whether it actually protects the engine.
Would I be strict with the Case IH Magnum 325 air filter condition?
Yes. The power-to-filter-size relationship makes restriction and seal condition worth taking seriously. Replace a questionable element before heavy dusty work.
What symptoms point to air restriction on a Case IH Magnum 325?
Use the power class to decide urgency. Higher airflow demand means less patience for questionable media, bad seals or packed pleats.
What part-number mistake should I avoid on a Case IH Magnum 325?
When there are several part numbers, do not search them all in one cart and hope. Label each one as primary, outer or safety before buying.
Official information note
Mistakes do happen. Air filter specs can change by year, engine, serial range, market and air cleaner housing. Check the old filter, operator manual, parts book and official caseih.com website before ordering or installing an air filter.
